GRE Geometry - Solid Geometry

Questions that pertain to solid geometry will require you to be familiar with the "volumes" of solid objects, most often simple rectangular shapes and cylindrical shapes. On a few of the harder GRE math questions, you'll need to be familiar with the concept of a diagonal in a rectangular shape. You'll need to be able to distinguish between the surface area and volume

For a rectangular or cylindrical 3D object, you'll need to memorize the formulas for the volume and surface area.

a cube and a cylinder

Any tricks that you may encounter will most likely involve having to change between units or will require you to use various properties of triangles.